322 ASA A. SCHAEFFER 



worm painted with CaClz was presented. It was eaten at once. 

 After it was down the frog rubbed his belly several times ^^•ith 

 his fore feet. 



Second day. 11.30 a. m. An earthworm treated with CaClj 

 was presented. It was eaten at once. The frog rubbed his 

 belly with both fore feet. I presented a small untreated worm. 

 It was eaten in 30 seconds. Another worm treated with CaClz 

 was eaten in 30 seconds. The frog was then given a worm 

 treated with oil of cloves. This worm was eaten in 15 seconds. 

 The frog began to jump about actively seemingly trying to get 

 under something. Finally he jumped into the water and re- 

 mained there. 



Second day. 2.30 p. m. A worm treated with CaCl, was 

 eaten promptly. The frog's hind legs twitched a little ; followed 

 by a rubbing of the belly. Another worm treated with CaClj was 

 eaten promptly. ^ 



Third day. A worm treated with CaClj was presented. It 

 was eaten promptly. A worm dusted with powdered quinine 

 sulphate was also eaten promptly. Following this I put normal 

 worms into the cage, but for 10 minutes none were eaten. On 

 three occasions the frog hopped away from the worms after 

 seeing them for a minute or so. In about 30 minutes I placed 

 a normal worm into the cage. It was eaten in a few seconds. 



Fourth day. A worm treated with CaClj was snapped up 

 in a few seconds. After the worm was down the frog rubbed 

 the point of his nose with the fore feet. Apparently some 

 of the iritating CaCl2 was brought into contact with the nose 

 while the worm was being swallowed. 



No experiments were made on the fifth and sixth days. 



Seventh day. A worm treated with CaCls was eaten in 10 

 seconds. The frog rubbed his belly. In two minutes another 

 CaClj worm was presented and promptly eaten. Again the 

 frog rubbed his belly. There seemed to have been too much 

 CaCl, for the frog seemed to try to get rid of the worm. 



Eighth day. A normal untreated worm when placed into the 

 cage was eaten in one minute. Another worm was not eaten 

 in four minutes. 



Ninth day. I attached one electrode of an induced current 

 to the wet sand in the cage, and the other, en ling in a very thin 

 wire, to an earthworm lying on a small sheet of glass. The 



